mpirun -np 1 ./fbfs Gen 23 > ran_scale23_p1
mpirun -np 4 ./fbfs Gen 23 > ran_scale23_p4
mpirun -np 9 ./fbfs Gen 23 > ran_scale23_p9
mpirun -np 16 ./fbfs Gen 23 > ran_scale23_p16
mpirun -np 25 ./fbfs Gen 23 > ran_scale23_p25
mpirun -np 36 ./fbfs Gen 23 > ran_scale23_p36
